DP Chemistry (last assessment 2024)

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Question 19N.3.hl.TZ0.d

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Date November 2019 Marks available [Maximum mark: 2] Reference code 19N.3.hl.TZ0.d
Level hl Paper 3 Time zone TZ0
Command term Discuss Question number d Adapted from N/A
d.
[Maximum mark: 2]
19N.3.hl.TZ0.d

The discovery of penicillins contributed to the development of antibiotics.

Discuss two difficulties, apart from socio-economic factors, associated with finding a cure for AIDS.

[2]

Markscheme

Any two of:

HIV difficult to detect/remains dormant ✔

HIV mutates rapidly/quickly ✔

HIV replicates rapidly/quickly ✔

HIV destroys «T-»helper cells/white blood cells/lymphocytes
OR
HIV attacks immune system ✔

HIV has several «significantly different» strains/subtypes ✔

NOTE: Accept “virus” for “HIV”.
Do not accept “AIDS mutates” without mention of the HIV/virus.
Penalize the use of “AIDS” for “HIV” once only.
Accept “HIV metabolism linked to that of host cell” OR “drugs harm host cell as well as HIV”.

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